diff --git a/TGInstallerWrapper/Main.cs b/TGInstallerWrapper/Main.cs
index 76b6c82af7..13d70faa93 100644
--- a/TGInstallerWrapper/Main.cs
+++ b/TGInstallerWrapper/Main.cs
@@ -95,6 +95,8 @@ namespace TGInstallerWrapper
 			try
 			{
 				VersionLabel.Text = (string)Version.Invoke(GetComponentITGSService.Invoke(null, null), null);
+				if (VersionLabel.Text.Contains("v3.0")) //OH GOD!!!!
+					MessageBox.Show("Warning! Upgrading from version 3.0 may trigger a bug that can delete /config and /data. IT IS STRONGLY RECCOMMENDED THAT YOU BACKUP THESE FOLDERS BEFORE UPDATING!");
 			}
 			catch
 			{